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Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings per share:        
Net earnings [1] $ 5,100 $ 2,598 $ 8,463 $ 4,781
Weighted average common shares outstanding - basic [1] 4,496,000 4,590,722 4,537,796 4,590,722
Assumed exercise of stock options [1] 18,313 15,464 18,262 15,011
Weighted average common shares outstanding - diluted [1] 4,514,313 4,606,186 4,556,058 4,605,733
Earnings per share: Basic [1],[2] $ 1.13 $ 0.57 $ 1.87 $ 1.04
Earnings per share: Diluted [1],[2] $ 1.13 $ 0.56 $ 1.86 $ 1.04
Stock dividend, percentage     5.00%  
[1] Share and per share values for the periods ended June 30, 2019 have been adjusted to give effect to the 5% stock dividend paid during December 2019.
[2] Per share amounts for the periods ended June 30, 2019 have been adjusted to give effect to the 5% stock dividend paid during December 2019.